1491761 has 2 divisors, whose sum is σ = 1491762. Its totient is φ = 1491760.

The previous prime is 1491739. The next prime is 1491769. The reversal of 1491761 is 1671941.

1491761 is nontrivially palindromic in base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 891136 + 600625 = 944^2 + 775^2 .

It is an emirp because it is prime and its reverse (1671941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491761 - 2¹⁰ = 1490737 is a prime.

It is a super-2 number, since 2×1491761² = 4450701762242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1491769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745880 + 745881.

It is an arithmetic number, because the mean of its divisors is an integer number (745881).

2^1491761 is an apocalyptic number.

It is an amenable number.

1491761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491761 is an equidigital number, since it uses as much as digits as its factorization.

1491761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 1491761 is about 1221.3766822729. The cubic root of 1491761 is about 114.2614548955.

The spelling of 1491761 in words is "one million, four hundred ninety-one thousand, seven hundred sixty-one".